Process for the production of calcium nitrate.



.Processes for cium.

UNITED STATES PATE- CARL THEODOR THORSSELL AND HARALD LUDVIG REINHOLD LUNDEN, OF GOTTEN- BORG, SWEDEN.

PROCESS FOR THE rzaonu'orrorr or cALcI i/i NI'IRATE.

N 0 Drawing.

To all whom it may concern:

Be it known that we, CARL THEODOR THORSSELL, a citizen of Sweden, residing at Sodra Hamngatan 11, Gottenborg, Sweden, and HARALI) Louvre REINI-IOLD LUNDIN, a citizen of Sweden, residing at Sodra Hamngatan 11, Gottenborg, Sweden, have invent ed certain new and useful Improvements in the- Production of Calcium Nitrate, of which the following is a specification.

The transformation of ammonia or ammonium combinations into nitrates by oxidathe presence of an alkali is already known. These bacteria abound in fertile garden soil.

It has become evident, however, that also cyanamid of calcium to form nitrate of calcium by means of such nitrificating bacteria in the following manner: The cyanamid of calcium is dissolved in water or in water containing carbonic acid in order to neutralize possibly occurring oxid of calcium whereafter this solution is mixed with a solution of nitrate of cal- The mixture thus obtained is used as liquid of nutriment, 2'. 6., it is brought into an intimate contact with the bacteria carried by a suitable substratum (for instance soil mixed with powdered coke) during ample admittance of air, whereat the cyanamid of calcium is transformed into nitrate of calcium.

One tenth, for solution of nitrate tage be set aside for preparing the finished article, while the rest is mixed with fresh solution of cyanamid of calcium and then instance, of the finished serves as fresh liquid of nutriment, etc., in

order to get a high concentration of-the solution, as the bacteria bear stronger solutions of nitrate of calcium than of cyanamid.

he process may be carried out in the following manner: A water solution containing 10 per cent. of nitrate of calcium and 0.5

per cent. of cyanamid of calcium is allowed Specification of Letters Patent.

t1on by means of nitrificating bacteria in ma be-reacted upon of calcium may to advan-' Patented Dec.3,1918.

Application filed April 10, 1918. Serial No. 227,796.

that the original concentration is maintained.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is 1. The'process for the production of nitrate of calcium from cyanamid of calcium, in which the cyanamid of calcium is dissolved in water and mixed with a solution of nitrate of calcium, whereafter the mixture is brought into intimate contact with nitrificating bacteria during ample supply of air.

2. The process for the production of nitrate of calcium from. cyanamid of calcium,

in which the cyanamid of calcium is dissolved 1n water and mixed with a solutlon of nitrate of calcium, whereafter the mixture is brough into intimate contact with nitrificating bacteria with an ample supply of air, a smaller part, for instance one tenth, of the solution of nitrate of calcium already oxidized being set aside for preparing the finished article while the rest is mixed with fresh solution of cyanamid of calcium and used as fresh liquid of nutriment for the purpose of obtaining a stronger solution of nitrate which is thedesired product.

In testimony whereof, we have signed our names to this specification in the presence of two subscribing witnesses.

CARL THEODOR THORSSELL. HARALD LUDVIG REINHOLD LUNDEN.

Witnesses:

ROBERT F. TOWNSEND, SYLVESTER E. RQTHCHILDS. 

